From The Collaborative International Dictionary of English v.0.48:

Concussion \Con*cus"sion\, n. [L. concussio, fr. concutere,
   concussum, to shake violenty; con- + quatere to shake. See
   Cashier, Quash.]
   1. A shaking or agitation; a shock; caused by the collision
      of two bodies.
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            It is believed that great ringing of bells, in
            populous cities, hath dissipated pestilent air;
            which may be from the concussion of the air.
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   2. (Med.) A condition of lowered functional activity, without
      visible structural change, produced in an organ by a
      shock, as by fall or blow; as, a concussion of the brain.
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   3. (Civil Law) The unlawful forcing of another by threats of
      violence to yield up something of value.
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            Then concussion, rapine, pilleries,
            Their catalogue of accusations fill.  --Daniel.
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   Concussion fuse (Mil.), one that is ignited by the
      concussion of the shell when it strikes.

   Syn: See Shock.
        [1913 Webster]
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